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From: FC138001@ysub.ysu.edu (Phil Munro)
Newsgroups: sci.electronics
Subject: Re: Discrete transistor models (SPICE) wanted
Message-ID: <91122.105828FC138001@ysub.ysu.edu>
Date: 2 May 91 14:58:28 GMT
References: <1991May2.123900.2844@e2big.mko.dec.com>
Distribution: usa
Organization: Youngstown State University VM system (YSUB)
Lines: 36

>> James W. Swonger writes...
>> I need to snarf some SPICE models for discrete transistors. Anybody know
>>of any ftp sources for manufacturers like Moto and TI?
>>
> John Erickson replys:
>        I can never figure out why folks ask questions like this. Spice
>        knows how to model transistors, all you have to do is give it
>        the parameters from the Data Book! I don't get why anyone would
>        want to ftp, like, one or two lines of Spice source!
>
>> Failing that, anyone want to e-mail me a model for the 2N4209?
>
>        The 2N4209 is a PNP switching transistor, TO-18 package
>
>        Vceo:   15V
>        Vcbo:   15V
>        hFE:    50-120 @Ic=10mA/Vce=0.3V
>        Vce(sat): 0.18V @ Ic=10mA/Ib=1.0mA
>
>        Just plug these values in to your standard SPICE model!
>
  The spec sheet for the 2N4209 will include *MUCH* more information than
that contained just above!!  BJT modeling has come far beyond just
plugging in a few parameters.  For example, look at some of the readily
available (e.g., evaluation versions of PSpice) BJT models to see the
multitude of parameters which one can include to sharpen BJT models.

  It's the word *just* above that causes the problem.  Spec sheet values
don't go directly into the Spice BJT model.  One might want to look at
something like Microsim's PARTS program which comes with PSpice.  It
allows the user to develop his/her own models from spec-sheet and
experimental data.

  But before we go any further with this, let us note that J.W. Swonger
was asking for an *easy* way to get a (good?) model for the 2N4209.
Perhaps someone can help him!  --Phil